ata: libata: Print device quirks only once

In ata_dev_print_quirks(), return early if ata_dev_print_info() returns
false or if we already printed quirk information. This is to avoid
printing a device quirks multiple times (that is, each time
ata_dev_revalidate() is called).

To remember if ata_dev_print_quirks() was already executed, define the
EH context flag ATA_EHI_DID_PRINT_QUIRKS and set this flag in
ata_dev_print_quirks().

Reported-by: Geert Uytterhoeven <geert@linux-m68k.org>
Fixes: 58157d6 ("ata: libata: Print quirks applied to devices")
Signed-off-by: Damien Le Moal <dlemoal@kernel.org>
Tested-by: Geert Uytterhoeven <geert+renesas@glider.be>

drivers/ata/libata-core.c

@@ -160,7 +160,7 @@ MODULE_DESCRIPTION("Library module for ATA devices");
 MODULE_LICENSE("GPL");
 MODULE_VERSION(DRV_VERSION);
 
-static inline bool ata_dev_print_info(struct ata_device *dev)
+static inline bool ata_dev_print_info(const struct ata_device *dev)
 {
 	struct ata_eh_context *ehc = &dev->link->eh_context;
 
@@ -4025,10 +4025,16 @@ static void ata_dev_print_quirks(const struct ata_device *dev,
 				 const char *model, const char *rev,
 				 unsigned int quirks)
 {
+	struct ata_eh_context *ehc = &dev->link->eh_context;
 	int n = 0, i;
 	size_t sz;
 	char *str;
 
+	if (!ata_dev_print_info(dev) || ehc->i.flags & ATA_EHI_DID_PRINT_QUIRKS)
+		return;
+
+	ehc->i.flags |= ATA_EHI_DID_PRINT_QUIRKS;
+
 	if (!quirks)
 		return;
 

include/linux/libata.h

@@ -378,6 +378,7 @@ enum {
 	ATA_EHI_PRINTINFO	= (1 << 18), /* print configuration info */
 	ATA_EHI_SETMODE		= (1 << 19), /* configure transfer mode */
 	ATA_EHI_POST_SETMODE	= (1 << 20), /* revalidating after setmode */
+	ATA_EHI_DID_PRINT_QUIRKS = (1 << 21), /* already printed quirks info */
 
 	ATA_EHI_DID_RESET	= ATA_EHI_DID_SOFTRESET | ATA_EHI_DID_HARDRESET,