spi: imx: wait_for_completion_timeout(..) for PIO transfers
In some rare cases I see the following 'task blocked' information. It looks like the PIO transfer has some problems and never succeeds. Make use of wait_for_completion_timeout(..) to detect this case and return -ETIMEDOUT. [ 240.246067] INFO: task hexdump:1660 blocked for more than 120 seconds. [ 240.246089] Not tainted 4.1.17 0000001 [ 240.246099] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 240.246109] hexdump D c0575548 0 1660 1 0x00000000 [ 240.246132] Backtrace: [ 240.246166] [<c057524c>] (__schedule) from [<c0575a84>] (schedule+0x40/0xa4) [ 240.246176] r10:00000000 r9:c07f1300 r8:c07b8408 r7:c0576518 r6:7fffffff r5:7fffffff [ 240.246210] r4:ee972e7c [ 240.246233] [<c0575a44>] (schedule) from [<c0578544>] (schedule_timeout+0x174/0x274) [ 240.246254] [<c05783d0>] (schedule_timeout) from [<c0576518>] (wait_for_common+0xc0/0x164) [ 240.246263] r10:00000000 r9:c07f1300 r8:00000002 r7:00000000 r6:7fffffff r5:ee972e78 [ 240.246294] r4:ee972e7c [ 240.246314] [<c0576458>] (wait_for_common) from [<c05765dc>] (wait_for_completion+0x20/0x24) [ 240.246324] r10:ee972e50 r8:00000001 r7:c3976200 r6:ee972c00 r5:ee972e50 r4:c2c87d28 [ 240.246367] [<c05765bc>] (wait_for_completion) from [<c03f6b04>] (spi_imx_transfer+0xe8/0x3cc) [ 240.246393] [<c03f6a1c>] (spi_imx_transfer) from [<c03f50e4>] (spi_bitbang_transfer_one+0xb4/0x250) [ 240.246403] r10:ee972e50 r8:00000001 r7:00000000 r6:c2c87da0 r5:00000000 r4:c2c87d28 [ 240.246443] [<c03f5030>] (spi_bitbang_transfer_one) from [<c03f36e8>] (__spi_pump_messages+0x36c/0x6b4) [ 240.246452] r10:ee9e5010 r9:00000001 r8:ee9e5010 r7:00000000 r6:c2c87da0 r5:c2c87d6c [ 240.246483] r4:ee972c00 [ 240.246503] [<c03f337c>] (__spi_pump_messages) from [<c03f3b68>] (__spi_sync+0x138/0x1e4) [ 240.246512] r10:00000000 r9:00000000 r8:c03f25a8 r7:00000000 r6:ee972c00 r5:c3976200 [ 240.246542] r4:c2c87da0 [ 240.246562] [<c03f3a30>] (__spi_sync) from [<c03f3c50>] (spi_sync+0x1c/0x20) [ 240.246571] r10:00040000 r9:00000000 r8:c3976200 r7:00000000 r6:ee973300 r5:c2c87da0 [ 240.246602] r4:ee973014 [ 240.246623] [<c03f3c34>] (spi_sync) from [<c03f0210>] (m25p80_read+0xf8/0x124) [ 240.246641] [<c03f0118>] (m25p80_read) from [<c03f1528>] (spi_nor_read+0x64/0x80) [ 240.246651] r10:00004000 r8:00004000 r7:00000000 r6:00040000 r5:00000000 r4:ee973014 [ 240.246698] [<c03f14c4>] (spi_nor_read) from [<c03cdcb4>] (mtd_read+0x98/0xcc) [ 240.246708] r7:c2c87ea0 r6:ee973098 r5:00000000 r4:001c0000 [ 240.246740] [<c03cdc1c>] (mtd_read) from [<c03d300c>] (mtdchar_read+0xcc/0x204) [ 240.246750] r9:ed424000 r8:00000000 r7:b495d018 r6:c2c87f78 r5:00000000 r4:00040000 [ 240.246793] [<c03d2f40>] (mtdchar_read) from [<c013b1c4>] (__vfs_read+0x3c/0xe0) [ 240.246803] r10:00004000 r9:00000000 r8:c2c87f78 r7:b495d018 r6:c2c87f78 r5:c05c8104 [ 240.246833] r4:c32fe600 [ 240.246852] [<c013b188>] (__vfs_read) from [<c013befc>] (vfs_read+0x98/0x154) [ 240.246861] r10:00000000 r8:00040000 r7:00004000 r6:c2c87f78 r5:b495d018 r4:c32fe600 [ 240.246899] [<c013be64>] (vfs_read) from [<c013c008>] (SyS_read+0x50/0x90) [ 240.246908] r10:00000000 r8:00040000 r7:b495d018 r6:00004000 r5:c32fe601 r4:c32fe600 [ 240.246953] [<c013bfb8>] (SyS_read) from [<c000fa60>] (ret_fast_syscall+0x0/0x3c) [ 240.246962] r9:c2c86000 r8:c000fc04 r7:00000003 r6:00004000 r5:00000000 r4:b495d018 Signed-off-by: Christian Gmeiner <christian.gmeiner@gmail.com> Signed-off-by: Mark Brown <broonie@kernel.org>
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@ -1042,6 +1042,8 @@ static int spi_imx_pio_transfer(struct spi_device *spi,
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struct spi_transfer *transfer)
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{
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struct spi_imx_data *spi_imx = spi_master_get_devdata(spi->master);
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unsigned long transfer_timeout;
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unsigned long timeout;
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spi_imx->tx_buf = transfer->tx_buf;
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spi_imx->rx_buf = transfer->rx_buf;
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@ -1054,7 +1056,15 @@ static int spi_imx_pio_transfer(struct spi_device *spi,
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spi_imx->devtype_data->intctrl(spi_imx, MXC_INT_TE);
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wait_for_completion(&spi_imx->xfer_done);
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transfer_timeout = spi_imx_calculate_timeout(spi_imx, transfer->len);
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timeout = wait_for_completion_timeout(&spi_imx->xfer_done,
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transfer_timeout);
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if (!timeout) {
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dev_err(&spi->dev, "I/O Error in PIO\n");
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spi_imx->devtype_data->reset(spi_imx);
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return -ETIMEDOUT;
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}
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return transfer->len;
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}
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