From: Ulf Hansson ulf.hansson@linaro.org
[ Upstream commit d6c9219ca1139b74541b2a98cee47a3426d754a9 ]
Even if the current WARN() notifies the user that something is severely wrong, we can still end up in a PANIC() when trying to invoke the missing ->enable_sdio_irq() ops. Therefore, let's also return an error code and prevent the host from being added.
While at it, move the code into a separate function to prepare for subsequent changes and for further host caps validations.
Signed-off-by: Ulf Hansson ulf.hansson@linaro.org Link: https://lore.kernel.org/r/20220303165142.129745-1-ulf.hansson@linaro.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/mmc/core/host.c | 15 +++++++++++++-- 1 file changed, 13 insertions(+), 2 deletions(-)
--- a/drivers/mmc/core/host.c +++ b/drivers/mmc/core/host.c @@ -403,6 +403,16 @@ again:
EXPORT_SYMBOL(mmc_alloc_host);
+static int mmc_validate_host_caps(struct mmc_host *host) +{ + if (host->caps & MMC_CAP_SDIO_IRQ && !host->ops->enable_sdio_irq) { + dev_warn(host->parent, "missing ->enable_sdio_irq() ops\n"); + return -EINVAL; + } + + return 0; +} + /** * mmc_add_host - initialise host hardware * @host: mmc host @@ -415,8 +425,9 @@ int mmc_add_host(struct mmc_host *host) { int err;
- WARN_ON((host->caps & MMC_CAP_SDIO_IRQ) && - !host->ops->enable_sdio_irq); + err = mmc_validate_host_caps(host); + if (err) + return err;
err = device_add(&host->class_dev); if (err)