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Diffstat (limited to 'include/linux/libata.h')
-rw-r--r--include/linux/libata.h23
1 files changed, 18 insertions, 5 deletions
diff --git a/include/linux/libata.h b/include/linux/libata.h
index eccc38e17568..46aa4ab64891 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -433,7 +433,7 @@ struct ata_host {
void __iomem * const *iomap;
unsigned int n_ports;
void *private_data;
- const struct ata_port_operations *ops;
+ struct ata_port_operations *ops;
unsigned long flags;
#ifdef CONFIG_ATA_ACPI
acpi_handle acpi_handle;
@@ -602,7 +602,7 @@ struct ata_link {
struct ata_port {
struct Scsi_Host *scsi_host; /* our co-allocated scsi host */
- const struct ata_port_operations *ops;
+ struct ata_port_operations *ops;
spinlock_t *lock;
unsigned long flags; /* ATA_FLAG_xxx */
unsigned int pflags; /* ATA_PFLAG_xxx */
@@ -664,6 +664,13 @@ struct ata_port {
u8 sector_buf[ATA_SECT_SIZE]; /* owned by EH */
};
+/* The following initializer overrides a method to NULL whether one of
+ * its parent has the method defined or not. This is equivalent to
+ * ERR_PTR(-ENOENT). Unfortunately, ERR_PTR doesn't render a constant
+ * expression and thus can't be used as an initializer.
+ */
+#define ATA_OP_NULL (void *)(unsigned long)(-ENOENT)
+
struct ata_port_operations {
/*
* Command execution
@@ -733,6 +740,12 @@ struct ata_port_operations {
void (*phy_reset)(struct ata_port *ap);
void (*eng_timeout)(struct ata_port *ap);
irq_handler_t irq_handler;
+
+ /*
+ * ->inherits must be the last field and all the preceding
+ * fields must be pointers.
+ */
+ const struct ata_port_operations *inherits;
};
struct ata_port_info {
@@ -742,7 +755,7 @@ struct ata_port_info {
unsigned long pio_mask;
unsigned long mwdma_mask;
unsigned long udma_mask;
- const struct ata_port_operations *port_ops;
+ struct ata_port_operations *port_ops;
irq_handler_t irq_handler;
void *private_data;
};
@@ -765,7 +778,7 @@ extern const unsigned long sata_deb_timing_normal[];
extern const unsigned long sata_deb_timing_hotplug[];
extern const unsigned long sata_deb_timing_long[];
-extern const struct ata_port_operations ata_dummy_port_ops;
+extern struct ata_port_operations ata_dummy_port_ops;
extern const struct ata_port_info ata_dummy_port_info;
static inline const unsigned long *
@@ -812,7 +825,7 @@ extern int ata_host_activate(struct ata_host *host, int irq,
struct scsi_host_template *sht);
extern void ata_host_detach(struct ata_host *host);
extern void ata_host_init(struct ata_host *, struct device *,
- unsigned long, const struct ata_port_operations *);
+ unsigned long, struct ata_port_operations *);
extern int ata_scsi_detect(struct scsi_host_template *sht);
extern int ata_scsi_ioctl(struct scsi_device *dev, int cmd, void __user *arg);
extern int ata_scsi_queuecmd(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *));