ide: fix resume for CONFIG_BLK_DEV_IDEACPI=y

commit 2f0d0fd2a605666d38e290c5c0d2907484352dc4 ("ide-acpi: cleanup
do_drive_get_GTF()") didn't account for the lack of hwif->acpidata
check in generic_ide_suspend() [ indirect user of do_drive_get_GTF()
through ide_acpi_exec_tfs() ] resulting in broken resume when ACPI
support is enabled but ACPI data is unavailable.

Fix it by adding ide_port_acpi() helper for checking if port needs
ACPI handling and cleaning generic_ide_{suspend,resume}() to use it
instead of hiding hwif->acpidata and ide_noacpi checks in IDE ACPI
helpers (this should help in preventing similar bugs in the future).

While at it:
- kill superfluous debugging printks in ide_acpi_{get,push}_timing()

Reported-and-tested-by: Etienne Basset <etienne.basset@numericable.fr>
Also-reported-and-tested-by: Jeff Chua <jeff.chua.linux@gmail.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

3 files changed, 27 insertions, 42 deletions

diff --git a/drivers/ide/ide-acpi.c b/drivers/ide/ide-acpi.c
index 77f79d26b264..c509c9916464 100644
--- a/drivers/ide/ide-acpi.c
+++ b/drivers/ide/ide-acpi.c
@@ -92,6 +92,11 @@ int ide_acpi_init(void)
         return 0;
 }
 
+bool ide_port_acpi(ide_hwif_t *hwif)
+{
+        return ide_noacpi == 0 && hwif->acpidata;
+}
+
 /**
  * ide_get_dev_handle - finds acpi_handle and PCI device.function
  * @dev: device to locate
@@ -352,9 +357,6 @@ int ide_acpi_exec_tfs(ide_drive_t *drive)
         unsigned long   gtf_address;
         unsigned long   obj_loc;
 
-        if (ide_noacpi)
-                return 0;
-
         DEBPRINT("call get_GTF, drive=%s port=%d\n", drive->name, drive->dn);
 
         ret = do_drive_get_GTF(drive, &gtf_length, &gtf_address, &obj_loc);
@@ -389,16 +391,6 @@ void ide_acpi_get_timing(ide_hwif_t *hwif)
         struct acpi_buffer      output;
         union acpi_object       *out_obj;
 
-        if (ide_noacpi)
-                return;
-
-        DEBPRINT("ENTER:\n");
-
-        if (!hwif->acpidata) {
-                DEBPRINT("no ACPI data for %s\n", hwif->name);
-                return;
-        }
-
         /* Setting up output buffer for _GTM */
         output.length = ACPI_ALLOCATE_BUFFER;
         output.pointer = NULL;  /* ACPI-CA sets this; save/free it later */
@@ -479,16 +471,6 @@ void ide_acpi_push_timing(ide_hwif_t *hwif)
         struct ide_acpi_drive_link      *master = &hwif->acpidata->master;
         struct ide_acpi_drive_link      *slave = &hwif->acpidata->slave;
 
-        if (ide_noacpi)
-                return;
-
-        DEBPRINT("ENTER:\n");
-
-        if (!hwif->acpidata) {
-                DEBPRINT("no ACPI data for %s\n", hwif->name);
-                return;
-        }
-
         /* Give the GTM buffer + drive Identify data to the channel via the
          * _STM method: */
         /* setup input parameters buffer for _STM */
@@ -527,16 +509,11 @@ void ide_acpi_set_state(ide_hwif_t *hwif, int on)
         ide_drive_t *drive;
         int i;
 
-        if (ide_noacpi || ide_noacpi_psx)
+        if (ide_noacpi_psx)
                 return;
 
         DEBPRINT("ENTER:\n");
 
-        if (!hwif->acpidata) {
-                DEBPRINT("no ACPI data for %s\n", hwif->name);
-                return;
-        }
-
         /* channel first and then drives for power on and verse versa for power off */
         if (on)
                 acpi_bus_set_power(hwif->acpidata->obj_handle, ACPI_STATE_D0);
@@ -616,7 +593,7 @@ void ide_acpi_port_init_devices(ide_hwif_t *hwif)
                                  drive->name, err);
         }
 
-        if (!ide_acpionboot) {
+        if (ide_noacpi || ide_acpionboot == 0) {
                 DEBPRINT("ACPI methods disabled on boot\n");
                 return;
         }
diff --git a/drivers/ide/ide-pm.c b/drivers/ide/ide-pm.c
index c14ca144cffe..ad7be2669dcb 100644
--- a/drivers/ide/ide-pm.c
+++ b/drivers/ide/ide-pm.c
@@ -10,9 +10,11 @@ int generic_ide_suspend(struct device *dev, pm_message_t mesg)
         struct request_pm_state rqpm;
         int ret;
 
-        /* call ACPI _GTM only once */
-        if ((drive->dn & 1) == 0 || pair == NULL)
-                ide_acpi_get_timing(hwif);
+        if (ide_port_acpi(hwif)) {
+                /* call ACPI _GTM only once */
+                if ((drive->dn & 1) == 0 || pair == NULL)
+                        ide_acpi_get_timing(hwif);
+        }
 
         memset(&rqpm, 0, sizeof(rqpm));
         rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
@@ -26,9 +28,11 @@ int generic_ide_suspend(struct device *dev, pm_message_t mesg)
         ret = blk_execute_rq(drive->queue, NULL, rq, 0);
         blk_put_request(rq);
 
-        /* call ACPI _PS3 only after both devices are suspended */
-        if (ret == 0 && ((drive->dn & 1) || pair == NULL))
-                ide_acpi_set_state(hwif, 0);
+        if (ret == 0 && ide_port_acpi(hwif)) {
+                /* call ACPI _PS3 only after both devices are suspended */
+                if ((drive->dn & 1) || pair == NULL)
+                        ide_acpi_set_state(hwif, 0);
+        }
 
         return ret;
 }
@@ -42,13 +46,15 @@ int generic_ide_resume(struct device *dev)
         struct request_pm_state rqpm;
         int err;
 
-        /* call ACPI _PS0 / _STM only once */
-        if ((drive->dn & 1) == 0 || pair == NULL) {
-                ide_acpi_set_state(hwif, 1);
-                ide_acpi_push_timing(hwif);
-        }
+        if (ide_port_acpi(hwif)) {
+                /* call ACPI _PS0 / _STM only once */
+                if ((drive->dn & 1) == 0 || pair == NULL) {
+                        ide_acpi_set_state(hwif, 1);
+                        ide_acpi_push_timing(hwif);
+                }
 
-        ide_acpi_exec_tfs(drive);
+                ide_acpi_exec_tfs(drive);
+        }
 
         memset(&rqpm, 0, sizeof(rqpm));
         rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
diff --git a/include/linux/ide.h b/include/linux/ide.h
index c6af7c44d46c..edc93a6d931d 100644
--- a/include/linux/ide.h
+++ b/include/linux/ide.h
@@ -1419,6 +1419,7 @@ static inline void ide_dma_unmap_sg(ide_drive_t *drive,
 
 #ifdef CONFIG_BLK_DEV_IDEACPI
 int ide_acpi_init(void);
+bool ide_port_acpi(ide_hwif_t *hwif);
 extern int ide_acpi_exec_tfs(ide_drive_t *drive);
 extern void ide_acpi_get_timing(ide_hwif_t *hwif);
 extern void ide_acpi_push_timing(ide_hwif_t *hwif);
@@ -1427,6 +1428,7 @@ void ide_acpi_port_init_devices(ide_hwif_t *);
 extern void ide_acpi_set_state(ide_hwif_t *hwif, int on);
 #else
 static inline int ide_acpi_init(void) { return 0; }
+static inline bool ide_port_acpi(ide_hwif_t *hwif) { return 0; }
 static inline int ide_acpi_exec_tfs(ide_drive_t *drive) { return 0; }
 static inline void ide_acpi_get_timing(ide_hwif_t *hwif) { ; }
 static inline void ide_acpi_push_timing(ide_hwif_t *hwif) { ; }