6.4-stable review patch. If anyone has any objections, please let me know.
------------------
From: Shannon Nelson <shannon.nelson@xxxxxxx>
[ Upstream commit 0ea064e74bc8f915aba3f2d0fb3418247a09b73d ]
Don't rely on the PCI memory for the devcmd opcode because we
read a 0xff value if the PCI bus is broken, which can cause us
to report a bogus dev_cmd opcode later.
Fixes: 523847df1b37 ("pds_core: add devcmd device interfaces")
Signed-off-by: Shannon Nelson <shannon.nelson@xxxxxxx>
Reviewed-by: Brett Creeley <brett.creeley@xxxxxxx>
Reviewed-by: Simon Horman <horms@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20230824161754.34264-6-shannon.nelson@xxxxxxx
Signed-off-by: Jakub Kicinski <kuba@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
drivers/net/ethernet/amd/pds_core/dev.c | 7 ++-----
1 file changed, 2 insertions(+), 5 deletions(-)
diff --git a/drivers/net/ethernet/amd/pds_core/dev.c b/drivers/net/ethernet/amd/pds_core/dev.c
index 524f422ee7ace..f77cd9f5a2fda 100644
--- a/drivers/net/ethernet/amd/pds_core/dev.c
+++ b/drivers/net/ethernet/amd/pds_core/dev.c
@@ -121,7 +121,7 @@ static const char *pdsc_devcmd_str(int opcode)
}
}
-static int pdsc_devcmd_wait(struct pdsc *pdsc, int max_seconds)
+static int pdsc_devcmd_wait(struct pdsc *pdsc, u8 opcode, int max_seconds)
{
struct device *dev = pdsc->dev;
unsigned long start_time;
@@ -131,9 +131,6 @@ static int pdsc_devcmd_wait(struct pdsc *pdsc, int max_seconds)
int done = 0;
int err = 0;
int status;
- int opcode;
-
- opcode = ioread8(&pdsc->cmd_regs->cmd.opcode);
start_time = jiffies;
max_wait = start_time + (max_seconds * HZ);
@@ -180,7 +177,7 @@ int pdsc_devcmd_locked(struct pdsc *pdsc, union pds_core_dev_cmd *cmd,
memcpy_toio(&pdsc->cmd_regs->cmd, cmd, sizeof(*cmd));
pdsc_devcmd_dbell(pdsc);
- err = pdsc_devcmd_wait(pdsc, max_seconds);
+ err = pdsc_devcmd_wait(pdsc, cmd->opcode, max_seconds);
memcpy_fromio(comp, &pdsc->cmd_regs->comp, sizeof(*comp));
if ((err == -ENXIO || err == -ETIMEDOUT) && pdsc->wq)
--
2.40.1
