6.6-stable review patch. If anyone has any objections, please let me know.
------------------
From: Adrian Hunter <adrian.hunter@xxxxxxxxx>
commit ab069ce125965a5e282f7b53b86aee76ab32975c upstream.
sdhci_check_ro() can call mmc_gpio_get_ro() while holding the sdhci
host->lock spinlock. That would be a problem if the GPIO access done by
mmc_gpio_get_ro() needed to sleep.
However, host->lock is not needed anyway. The mmc core ensures that host
operations do not race with each other, and asynchronous callbacks like the
interrupt handler, software timeouts, completion work etc, cannot affect
sdhci_check_ro().
So remove the locking.
Fixes: 6d5cd068ee59 ("mmc: sdhci: use WP GPIO in sdhci_check_ro()")
Signed-off-by: Adrian Hunter <adrian.hunter@xxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Link: https://lore.kernel.org/r/20240614080051.4005-3-adrian.hunter@xxxxxxxxx
Signed-off-by: Ulf Hansson <ulf.hansson@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/mmc/host/sdhci.c | 5 -----
1 file changed, 5 deletions(-)
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -2516,11 +2516,8 @@ EXPORT_SYMBOL_GPL(sdhci_get_cd_nogpio);
static int sdhci_check_ro(struct sdhci_host *host)
{
bool allow_invert = false;
- unsigned long flags;
int is_readonly;
- spin_lock_irqsave(&host->lock, flags);
-
if (host->flags & SDHCI_DEVICE_DEAD) {
is_readonly = 0;
} else if (host->ops->get_ro) {
@@ -2535,8 +2532,6 @@ static int sdhci_check_ro(struct sdhci_h
allow_invert = true;
}
- spin_unlock_irqrestore(&host->lock, flags);
-
if (is_readonly >= 0 &&
allow_invert &&
(host->quirks & SDHCI_QUIRK_INVERTED_WRITE_PROTECT))
