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authorTejun Heo <htejun@gmail.com>2008-03-25 06:22:50 +0300
committerJeff Garzik <jgarzik@redhat.com>2008-04-17 23:44:18 +0400
commita1efdaba2dbd6fb89e23a87b66d3f4dd92c9f5af (patch)
tree6197c537892e0d887b2a90e369b74abf0500b9ac /drivers/ata/libata-pmp.c
parent959471936241bd83da7d0a76411cef6772140fe6 (diff)
downloadlinux-a1efdaba2dbd6fb89e23a87b66d3f4dd92c9f5af.tar.xz
libata: make reset related methods proper port operations
Currently reset methods are not specified directly in the ata_port_operations table. If a LLD wants to use custom reset methods, it should construct and use a error_handler which uses those reset methods. It's done this way for two reasons. First, the ops table already contained too many methods and adding four more of them would noticeably increase the amount of necessary boilerplate code all over low level drivers. Second, as ->error_handler uses those reset methods, it can get confusing. ie. By overriding ->error_handler, those reset ops can be made useless making layering a bit hazy. Now that ops table uses inheritance, the first problem doesn't exist anymore. The second isn't completely solved but is relieved by providing default values - most drivers can just override what it has implemented and don't have to concern itself about higher level callbacks. In fact, there currently is no driver which actually modifies error handling behavior. Drivers which override ->error_handler just wraps the standard error handler only to prepare the controller for EH. I don't think making ops layering strict has any noticeable benefit. This patch makes ->prereset, ->softreset, ->hardreset, ->postreset and their PMP counterparts propoer ops. Default ops are provided in the base ops tables and drivers are converted to override individual reset methods instead of creating custom error_handler. * ata_std_error_handler() doesn't use sata_std_hardreset() if SCRs aren't accessible. sata_promise doesn't need to use separate error_handlers for PATA and SATA anymore. * softreset is broken for sata_inic162x and sata_sx4. As libata now always prefers hardreset, this doesn't really matter but the ops are forced to NULL using ATA_OP_NULL for documentation purpose. * pata_hpt374 needs to use different prereset for the first and second PCI functions. This used to be done by branching from hpt374_error_handler(). The proper way to do this is to use separate ops and port_info tables for each function. Converted. Signed-off-by: Tejun Heo <htejun@gmail.com>
Diffstat (limited to 'drivers/ata/libata-pmp.c')
-rw-r--r--drivers/ata/libata-pmp.c47
1 files changed, 11 insertions, 36 deletions
diff --git a/drivers/ata/libata-pmp.c b/drivers/ata/libata-pmp.c
index 39e036c8a2bc..a7cb1498c9b2 100644
--- a/drivers/ata/libata-pmp.c
+++ b/drivers/ata/libata-pmp.c
@@ -962,14 +962,6 @@ static int sata_pmp_handle_link_fail(struct ata_link *link, int *link_tries)
/**
* sata_pmp_eh_recover - recover PMP-enabled port
* @ap: ATA port to recover
- * @prereset: prereset method (can be NULL)
- * @softreset: softreset method
- * @hardreset: hardreset method
- * @postreset: postreset method (can be NULL)
- * @pmp_prereset: PMP prereset method (can be NULL)
- * @pmp_softreset: PMP softreset method (can be NULL)
- * @pmp_hardreset: PMP hardreset method (can be NULL)
- * @pmp_postreset: PMP postreset method (can be NULL)
*
* Drive EH recovery operation for PMP enabled port @ap. This
* function recovers host and PMP ports with proper retrials and
@@ -982,12 +974,9 @@ static int sata_pmp_handle_link_fail(struct ata_link *link, int *link_tries)
* RETURNS:
* 0 on success, -errno on failure.
*/
-static int sata_pmp_eh_recover(struct ata_port *ap,
- ata_prereset_fn_t prereset, ata_reset_fn_t softreset,
- ata_reset_fn_t hardreset, ata_postreset_fn_t postreset,
- ata_prereset_fn_t pmp_prereset, ata_reset_fn_t pmp_softreset,
- ata_reset_fn_t pmp_hardreset, ata_postreset_fn_t pmp_postreset)
+static int sata_pmp_eh_recover(struct ata_port *ap)
{
+ struct ata_port_operations *ops = ap->ops;
int pmp_tries, link_tries[SATA_PMP_MAX_PORTS];
struct ata_link *pmp_link = &ap->link;
struct ata_device *pmp_dev = pmp_link->device;
@@ -1005,8 +994,8 @@ static int sata_pmp_eh_recover(struct ata_port *ap,
retry:
/* PMP attached? */
if (!ap->nr_pmp_links) {
- rc = ata_eh_recover(ap, prereset, softreset, hardreset,
- postreset, NULL);
+ rc = ata_eh_recover(ap, ops->prereset, ops->softreset,
+ ops->hardreset, ops->postreset, NULL);
if (rc) {
ata_link_for_each_dev(dev, &ap->link)
ata_dev_disable(dev);
@@ -1024,8 +1013,8 @@ static int sata_pmp_eh_recover(struct ata_port *ap,
}
/* recover pmp */
- rc = sata_pmp_eh_recover_pmp(ap, prereset, softreset, hardreset,
- postreset);
+ rc = sata_pmp_eh_recover_pmp(ap, ops->prereset, ops->softreset,
+ ops->hardreset, ops->postreset);
if (rc)
goto pmp_fail;
@@ -1035,8 +1024,8 @@ static int sata_pmp_eh_recover(struct ata_port *ap,
goto pmp_fail;
/* recover links */
- rc = ata_eh_recover(ap, pmp_prereset, pmp_softreset, pmp_hardreset,
- pmp_postreset, &link);
+ rc = ata_eh_recover(ap, ops->pmp_prereset, ops->pmp_softreset,
+ ops->pmp_hardreset, ops->pmp_postreset, &link);
if (rc)
goto link_fail;
@@ -1132,16 +1121,8 @@ static int sata_pmp_eh_recover(struct ata_port *ap,
}
/**
- * sata_pmp_do_eh - do standard error handling for PMP-enabled host
+ * sata_pmp_error_handler - do standard error handling for PMP-enabled host
* @ap: host port to handle error for
- * @prereset: prereset method (can be NULL)
- * @softreset: softreset method
- * @hardreset: hardreset method
- * @postreset: postreset method (can be NULL)
- * @pmp_prereset: PMP prereset method (can be NULL)
- * @pmp_softreset: PMP softreset method (can be NULL)
- * @pmp_hardreset: PMP hardreset method (can be NULL)
- * @pmp_postreset: PMP postreset method (can be NULL)
*
* Perform standard error handling sequence for PMP-enabled host
* @ap.
@@ -1149,16 +1130,10 @@ static int sata_pmp_eh_recover(struct ata_port *ap,
* LOCKING:
* Kernel thread context (may sleep).
*/
-void sata_pmp_do_eh(struct ata_port *ap,
- ata_prereset_fn_t prereset, ata_reset_fn_t softreset,
- ata_reset_fn_t hardreset, ata_postreset_fn_t postreset,
- ata_prereset_fn_t pmp_prereset, ata_reset_fn_t pmp_softreset,
- ata_reset_fn_t pmp_hardreset, ata_postreset_fn_t pmp_postreset)
+void sata_pmp_error_handler(struct ata_port *ap)
{
ata_eh_autopsy(ap);
ata_eh_report(ap);
- sata_pmp_eh_recover(ap, prereset, softreset, hardreset, postreset,
- pmp_prereset, pmp_softreset, pmp_hardreset,
- pmp_postreset);
+ sata_pmp_eh_recover(ap);
ata_eh_finish(ap);
}