platform/x86: panasonic-laptop: Allocate 1 entry extra in the sinf array

Some DSDT-s have an off-by-one bug where the SINF package count is
one higher than the SQTY reported value, allocate 1 entry extra.

Also make the SQTY <-> SINF package count mismatch error more verbose
to help debugging similar issues in the future.

This fixes the panasonic-laptop driver failing to probe() on some
devices with the following errors:

[    3.958887] SQTY reports bad SINF length SQTY: 37 SINF-pkg-count: 38
[    3.958892] Couldn't retrieve BIOS data
[    3.983685] Panasonic Laptop Support - With Macros: probe of MAT0019:00 failed with error -5

Fixes: 709ee531c153 ("panasonic-laptop: add Panasonic Let's Note laptop extras driver v0.94")
Cc: [email protected]
Tested-by: James Harmison <[email protected]>
Signed-off-by: Hans de Goede <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Reviewed-by: Ilpo Järvinen <[email protected]>
Signed-off-by: Ilpo Järvinen <[email protected]>

1 files changed, 8 insertions, 1 deletions

diff --git a/drivers/platform/x86/panasonic-laptop.c b/drivers/platform/x86/panasonic-laptop.c
index 39044119d2a6..ebd81846e2d5 100644
--- a/drivers/platform/x86/panasonic-laptop.c
+++ b/drivers/platform/x86/panasonic-laptop.c
@@ -337,7 +337,8 @@ static int acpi_pcc_retrieve_biosdata(struct pcc_acpi *pcc)
 	}
 
 	if (pcc->num_sifr < hkey->package.count) {
-		pr_err("SQTY reports bad SINF length\n");
+		pr_err("SQTY reports bad SINF length SQTY: %lu SINF-pkg-count: %u\n",
+		       pcc->num_sifr, hkey->package.count);
 		status = AE_ERROR;
 		goto end;
 	}
@@ -994,6 +995,12 @@ static int acpi_pcc_hotkey_add(struct acpi_device *device)
 		return -ENODEV;
 	}
 
+	/*
+	 * Some DSDT-s have an off-by-one bug where the SINF package count is
+	 * one higher than the SQTY reported value, allocate 1 entry extra.
+	 */
+	num_sifr++;
+
 	pcc = kzalloc(sizeof(struct pcc_acpi), GFP_KERNEL);
 	if (!pcc) {
 		pr_err("Couldn't allocate mem for pcc");