When using dm-verity with a data partition on an emmc device, dm-verity
races with the discovery of attached emmc devices. This is because mmc's
probing code sets up the host data structure then a work item is
scheduled to do discovery afterwards. To prevent this race on init,
let's inline the first call to detection, __mm_scan(), and let
subsequent detect calls be handled via the workqueue.
Signed-off-by: Dennis Zhou <dennis@xxxxxxxxxx>
---
drivers/mmc/core/core.c | 15 +++++++++++----
1 file changed, 11 insertions(+), 4 deletions(-)
diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
index 368f10405e13..c0fdc438c882 100644
--- a/drivers/mmc/core/core.c
+++ b/drivers/mmc/core/core.c
@@ -2185,10 +2185,8 @@ int mmc_card_alternative_gpt_sector(struct mmc_card *card, sector_t *gpt_sector)
}
EXPORT_SYMBOL(mmc_card_alternative_gpt_sector);
-void mmc_rescan(struct work_struct *work)
+void __mmc_rescan(struct mmc_host *host)
{
- struct mmc_host *host =
- container_of(work, struct mmc_host, detect.work);
int i;
if (host->rescan_disable)
@@ -2249,6 +2247,14 @@ void mmc_rescan(struct work_struct *work)
mmc_schedule_delayed_work(&host->detect, HZ);
}
+void mmc_rescan(struct work_struct *work)
+{
+ struct mmc_host *host =
+ container_of(work, struct mmc_host, detect.work);
+
+ __mmc_rescan(host);
+}
+
void mmc_start_host(struct mmc_host *host)
{
host->f_init = max(min(freqs[0], host->f_max), host->f_min);
@@ -2261,7 +2267,8 @@ void mmc_start_host(struct mmc_host *host)
}
mmc_gpiod_request_cd_irq(host);
- _mmc_detect_change(host, 0, false);
+ host->detect_change = 1;
+ __mmc_rescan(host);
}
void __mmc_stop_host(struct mmc_host *host)
--
2.40.0
