scsi: ufs: core: Export ufshcd_schedule_eh_work()

Make it possible to call ufshcd_schedule_eh_work() from other source files
than ufshcd.c. Additionally, convert a source code comment into a
lockdep_assert_held() call.

Link: https://lore.kernel.org/r/20211020214024.2007615-6-bvanassche@acm.org
Acked-by: Avri Altman <Avri.Altman@wdc.com>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/ufs/ufshcd.c

@@ -244,7 +244,6 @@ static int ufshcd_scale_clks(struct ufs_hba *hba, bool scale_up);
 static irqreturn_t ufshcd_intr(int irq, void *__hba);
 static int ufshcd_change_power_mode(struct ufs_hba *hba,
 			     struct ufs_pa_layer_attr *pwr_mode);
-static void ufshcd_schedule_eh_work(struct ufs_hba *hba);
 static int ufshcd_setup_hba_vreg(struct ufs_hba *hba, bool on);
 static int ufshcd_setup_vreg(struct ufs_hba *hba, bool on);
 static inline int ufshcd_config_vreg_hpm(struct ufs_hba *hba,
@@ -5915,9 +5914,10 @@ static inline bool ufshcd_is_saved_err_fatal(struct ufs_hba *hba)
 	       (hba->saved_err & (INT_FATAL_ERRORS | UFSHCD_UIC_HIBERN8_MASK));
 }
 
-/* host lock must be held before calling this func */
-static inline void ufshcd_schedule_eh_work(struct ufs_hba *hba)
+void ufshcd_schedule_eh_work(struct ufs_hba *hba)
 {
+	lockdep_assert_held(hba->host->host_lock);
+
 	/* handle fatal errors only when link is not in error state */
 	if (hba->ufshcd_state != UFSHCD_STATE_ERROR) {
 		if (hba->force_reset || ufshcd_is_link_broken(hba) ||

drivers/scsi/ufs/ufshcd.h

@@ -1023,6 +1023,7 @@ int ufshcd_wait_for_register(struct ufs_hba *hba, u32 reg, u32 mask,
 void ufshcd_parse_dev_ref_clk_freq(struct ufs_hba *hba, struct clk *refclk);
 void ufshcd_update_evt_hist(struct ufs_hba *hba, u32 id, u32 val);
 void ufshcd_hba_stop(struct ufs_hba *hba);
+void ufshcd_schedule_eh_work(struct ufs_hba *hba);
 
 static inline void check_upiu_size(void)
 {