From: Eddie James eajames@linux.ibm.com
[ Upstream commit 89b35e3f28514087d3f1e28e8f5634fbfd07c554 ]
The data transfer routines must poll the status register to determine when more data can be shifted in or out. If the hardware gets into a bad state, these polling loops may never exit. Prevent this by returning an error if a timeout is exceeded.
Signed-off-by: Eddie James eajames@linux.ibm.com Link: https://lore.kernel.org/r/20220317211426.38940-1-eajames@linux.ibm.com Signed-off-by: Mark Brown broonie@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/spi/spi-fsi.c | 10 ++++++++++ 1 file changed, 10 insertions(+)
diff --git a/drivers/spi/spi-fsi.c b/drivers/spi/spi-fsi.c index b6c7467f0b59..d403a7a3021d 100644 --- a/drivers/spi/spi-fsi.c +++ b/drivers/spi/spi-fsi.c @@ -25,6 +25,7 @@
#define SPI_FSI_BASE 0x70000 #define SPI_FSI_INIT_TIMEOUT_MS 1000 +#define SPI_FSI_STATUS_TIMEOUT_MS 100 #define SPI_FSI_MAX_RX_SIZE 8 #define SPI_FSI_MAX_TX_SIZE 40
@@ -299,6 +300,7 @@ static int fsi_spi_transfer_data(struct fsi_spi *ctx, struct spi_transfer *transfer) { int rc = 0; + unsigned long end; u64 status = 0ULL;
if (transfer->tx_buf) { @@ -315,10 +317,14 @@ static int fsi_spi_transfer_data(struct fsi_spi *ctx, if (rc) return rc;
+ end = jiffies + msecs_to_jiffies(SPI_FSI_STATUS_TIMEOUT_MS); do { rc = fsi_spi_status(ctx, &status, "TX"); if (rc) return rc; + + if (time_after(jiffies, end)) + return -ETIMEDOUT; } while (status & SPI_FSI_STATUS_TDR_FULL);
sent += nb; @@ -329,10 +335,14 @@ static int fsi_spi_transfer_data(struct fsi_spi *ctx, u8 *rx = transfer->rx_buf;
while (transfer->len > recv) { + end = jiffies + msecs_to_jiffies(SPI_FSI_STATUS_TIMEOUT_MS); do { rc = fsi_spi_status(ctx, &status, "RX"); if (rc) return rc; + + if (time_after(jiffies, end)) + return -ETIMEDOUT; } while (!(status & SPI_FSI_STATUS_RDR_FULL));
rc = fsi_spi_read_reg(ctx, SPI_FSI_DATA_RX, &in);