From: "Ying-Chun Liu (PaulLiu)" <paul.liu@xxxxxxxxxx>
If we don't check host->cmd. We will get the following oops
when booting from eMMC on RockPi4.
Unable to handle kernel read from unreadable memory at
virtual address 0000000000000000
Call trace:
sdhci_cqe_irq+0x40/0x254
Signed-off-by: Ying-Chun Liu (PaulLiu) <paul.liu@xxxxxxxxxx>
Signed-off-by: Ram Muthiah <rammuthiah@xxxxxxxxxx>
Cc: Adrian Hunter <adrian.hunter@xxxxxxxxx>
Cc: Ritesh Harjani <riteshh@xxxxxxxxxxxxxx>
Cc: Asutosh Das <asutoshd@xxxxxxxxxxxxxx>
Cc: Ulf Hansson <ulf.hansson@xxxxxxxxxx>
Cc: linux-mmc@xxxxxxxxxxxxxxx
---
drivers/mmc/host/sdhci.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index 7689ffec5ad1..e0e7768bd6c0 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -3928,7 +3928,7 @@ bool sdhci_cqe_irq(struct sdhci_host *host, u32 intmask, int *cmd_error,
if (intmask & (SDHCI_INT_INDEX | SDHCI_INT_END_BIT | SDHCI_INT_CRC)) {
*cmd_error = -EILSEQ;
- if (!mmc_op_tuning(host->cmd->opcode))
+ if (host->cmd && !mmc_op_tuning(host->cmd->opcode))
sdhci_err_stats_inc(host, CMD_CRC);
} else if (intmask & SDHCI_INT_TIMEOUT) {
*cmd_error = -ETIMEDOUT;
@@ -3938,7 +3938,7 @@ bool sdhci_cqe_irq(struct sdhci_host *host, u32 intmask, int *cmd_error,
if (intmask & (SDHCI_INT_DATA_END_BIT | SDHCI_INT_DATA_CRC)) {
*data_error = -EILSEQ;
- if (!mmc_op_tuning(host->cmd->opcode))
+ if (host->cmd && !mmc_op_tuning(host->cmd->opcode))
sdhci_err_stats_inc(host, DAT_CRC);
} else if (intmask & SDHCI_INT_DATA_TIMEOUT) {
*data_error = -ETIMEDOUT;
--
2.35.1
