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@@ -1,127 +0,0 @@
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-From: Gabor Juhos <[email protected]>
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-Subject: spi-fsl-espi: avoid frequent high order allocations
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-
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-The driver allocates 64KiB of memory fro a local buffer before
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-each transfer and releases that afterwards. When the memory is
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-fragmented this allocation often fails and causes a warning like
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-this:
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-
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- kworker/u2:2: page allocation failure: order:4, mode:0x10c0d0
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- CPU: 0 PID: 7011 Comm: kworker/u2:2 Not tainted 3.10.24 #1
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- Workqueue: ffe07000.spi mpc8xxx_spi_work
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- Call Trace:
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- [c1c6dcf0] [c0006914] show_stack+0x50/0x170 (unreliable)
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- [c1c6dd30] [c0259858] dump_stack+0x24/0x34
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- [c1c6dd40] [c00672e8] warn_alloc_failed+0x120/0x13c
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- [c1c6dd90] [c0069920] __alloc_pages_nodemask+0x574/0x5c8
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- [c1c6de20] [c0069990] __get_free_pages+0x1c/0x4c
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- [c1c6de30] [c0185174] fsl_espi_do_one_msg+0x128/0x2a0
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- [c1c6de90] [c0184290] mpc8xxx_spi_work+0x50/0x7c
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- [c1c6dea0] [c0037af8] process_one_work+0x208/0x30c
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- [c1c6dec0] [c00387a0] worker_thread+0x20c/0x308
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- [c1c6def0] [c003de60] kthread+0xa4/0xa8
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- [c1c6df40] [c000c4bc] ret_from_kernel_thread+0x5c/0x64
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-
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- m25p80 spi0.0: error -12 reading SR
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- end_request: I/O error, dev mtdblock3, sector 680
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- SQUASHFS error: squashfs_read_data failed to read block 0x54a4a
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- SQUASHFS error: Unable to read data cache entry [54a4a]
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-
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-Preallocate the buffer from the probe routine to avoid
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-this.
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-
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-Signed-off-by: Gabor Juhos <[email protected]>
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-Signed-off-by: Felix Fietkau <[email protected]>
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----
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- drivers/spi/spi-fsl-espi.c | 34 ++++++++++++++++------------------
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- drivers/spi/spi-fsl-lib.h | 1 +
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- 2 files changed, 17 insertions(+), 18 deletions(-)
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-
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---- a/drivers/spi/spi-fsl-espi.c
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-+++ b/drivers/spi/spi-fsl-espi.c
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-@@ -332,17 +332,13 @@ static void fsl_espi_do_trans(struct spi
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- static void fsl_espi_cmd_trans(struct spi_message *m,
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- struct fsl_espi_transfer *trans, u8 *rx_buff)
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- {
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-+ struct spi_device *spi = m->spi;
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-+ struct mpc8xxx_spi *mspi = spi_master_get_devdata(spi->master);
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- struct spi_transfer *t;
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-- u8 *local_buf;
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-+ u8 *local_buf = mspi->local_buf;
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- int i = 0;
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- struct fsl_espi_transfer *espi_trans = trans;
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-
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-- local_buf = kzalloc(SPCOM_TRANLEN_MAX, GFP_KERNEL);
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-- if (!local_buf) {
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-- espi_trans->status = -ENOMEM;
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-- return;
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-- }
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--
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- list_for_each_entry(t, &m->transfers, transfer_list) {
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- if (t->tx_buf) {
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- memcpy(local_buf + i, t->tx_buf, t->len);
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-@@ -355,16 +351,17 @@ static void fsl_espi_cmd_trans(struct sp
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- fsl_espi_do_trans(m, espi_trans);
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-
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- espi_trans->actual_length = espi_trans->len;
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-- kfree(local_buf);
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- }
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-
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- static void fsl_espi_rw_trans(struct spi_message *m,
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- struct fsl_espi_transfer *trans, u8 *rx_buff)
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- {
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-+ struct spi_device *spi = m->spi;
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-+ struct mpc8xxx_spi *mspi = spi_master_get_devdata(spi->master);
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- struct fsl_espi_transfer *espi_trans = trans;
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- unsigned int total_len = espi_trans->len;
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- struct spi_transfer *t;
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-- u8 *local_buf;
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-+ u8 *local_buf = mspi->local_buf;
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- u8 *rx_buf = rx_buff;
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- unsigned int trans_len;
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- unsigned int addr;
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-@@ -373,12 +370,6 @@ static void fsl_espi_rw_trans(struct spi
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- unsigned int pos;
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- int i, loop;
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-
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-- local_buf = kzalloc(SPCOM_TRANLEN_MAX, GFP_KERNEL);
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-- if (!local_buf) {
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-- espi_trans->status = -ENOMEM;
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-- return;
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-- }
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--
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- for (pos = 0, loop = 0; pos < total_len; pos += trans_len, loop++) {
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- trans_len = total_len - pos;
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-
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-@@ -424,8 +415,6 @@ static void fsl_espi_rw_trans(struct spi
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- else
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- espi_trans->actual_length += espi_trans->len;
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- }
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--
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-- kfree(local_buf);
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- }
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-
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- static int fsl_espi_do_one_msg(struct spi_master *master,
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-@@ -673,6 +662,12 @@ static struct spi_master * fsl_espi_prob
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-
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- mpc8xxx_spi = spi_master_get_devdata(master);
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-
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-+ mpc8xxx_spi->local_buf = devm_kzalloc(dev, SPCOM_TRANLEN_MAX, GFP_KERNEL);
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-+ if (!mpc8xxx_spi->local_buf) {
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-+ ret = -ENOMEM;
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-+ goto err_probe;
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-+ }
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-+
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- mpc8xxx_spi->reg_base = devm_ioremap_resource(dev, mem);
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- if (IS_ERR(mpc8xxx_spi->reg_base)) {
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- ret = PTR_ERR(mpc8xxx_spi->reg_base);
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---- a/drivers/spi/spi-fsl-lib.h
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-+++ b/drivers/spi/spi-fsl-lib.h
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-@@ -30,6 +30,7 @@ struct mpc8xxx_spi {
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- void *rx;
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- #if IS_ENABLED(CONFIG_SPI_FSL_ESPI)
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- int len;
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-+ u8 *local_buf;
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- #endif
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-
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- int subblock;
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Alexandru Ardelean