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ata: libata-core: Remove support for decreasing the number of ports

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Commit f31871951b ("libata: separate out ata_host_alloc() and
ata_host_register()") added ata_host_alloc(), where the API allowed
a LLD to overallocate the number of ports supplied to ata_host_alloc(),
as long as the LLD decreased host->n_ports before calling
ata_host_register().

However, this functionally has never ever been used by a single LLD.

Because of the current API design, the assignment of ap->print_id is
deferred until registration time, which is bad, because that means that
the ata_port_*() print functions cannot be used by a LLD until after
registration time, which means that a LLD is forced to use a print
function that is non-port specific, even for a port specific error.

Remove the support for decreasing the number of ports, such that it will
be possible to assign ap->print_id earlier.

Reviewed-by: Damien Le Moal <dlemoal@kernel.org>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Link: https://lore.kernel.org/r/20240703184418.723066-14-cassel@kernel.org
Signed-off-by: Niklas Cassel <cassel@kernel.org>
This commit is contained in:
Niklas Cassel
2024-07-03 20:44:20 +02:00
parent 2199d6ff56
commit 23262cce52
2 changed files with 6 additions and 18 deletions
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22
drivers/ata/libata-core.c
View File

@@ -5555,24 +5555,19 @@ EXPORT_SYMBOL_GPL(ata_host_put);
/**
* ata_host_alloc - allocate and init basic ATA host resources
* @dev: generic device this host is associated with
* @max_ports: maximum number of ATA ports associated with this host
* @n_ports: the number of ATA ports associated with this host
*
* Allocate and initialize basic ATA host resources. LLD calls
* this function to allocate a host, initializes it fully and
* attaches it using ata_host_register().
*
* @max_ports ports are allocated and host->n_ports is
* initialized to @max_ports. The caller is allowed to decrease
* host->n_ports before calling ata_host_register(). The unused
* ports will be automatically freed on registration.
*
* RETURNS:
* Allocate ATA host on success, NULL on failure.
*
* LOCKING:
* Inherited from calling layer (may sleep).
*/
struct ata_host *ata_host_alloc(struct device *dev, int max_ports)
struct ata_host *ata_host_alloc(struct device *dev, int n_ports)
{
struct ata_host *host;
size_t sz;
@@ -5580,7 +5575,7 @@ struct ata_host *ata_host_alloc(struct device *dev, int max_ports)
void *dr;
/* alloc a container for our list of ATA ports (buses) */
sz = sizeof(struct ata_host) + (max_ports + 1) * sizeof(void *);
sz = sizeof(struct ata_host) + n_ports * sizeof(void *);
host = kzalloc(sz, GFP_KERNEL);
if (!host)
return NULL;
@@ -5600,11 +5595,11 @@ struct ata_host *ata_host_alloc(struct device *dev, int max_ports)
spin_lock_init(&host->lock);
mutex_init(&host->eh_mutex);
host->dev = dev;
host->n_ports = max_ports;
host->n_ports = n_ports;
kref_init(&host->kref);
/* allocate ports bound to this host */
for (i = 0; i < max_ports; i++) {
for (i = 0; i < n_ports; i++) {
struct ata_port *ap;
ap = ata_port_alloc(host);
@@ -5913,13 +5908,6 @@ int ata_host_register(struct ata_host *host, const struct scsi_host_template *sh
return -EINVAL;
}
/* Blow away unused ports. This happens when LLD can't
* determine the exact number of ports to allocate at
* allocation time.
*/
for (i = host->n_ports; host->ports[i]; i++)
ata_port_free(host->ports[i]);
/* give ports names and add SCSI hosts */
for (i = 0; i < host->n_ports; i++) {
host->ports[i]->print_id = atomic_inc_return(&ata_print_id);

2
include/linux/libata.h
View File

@@ -1069,7 +1069,7 @@ extern int sata_std_hardreset(struct ata_link *link, unsigned int *class,
unsigned long deadline);
extern void ata_std_postreset(struct ata_link *link, unsigned int *classes);
extern struct ata_host *ata_host_alloc(struct device *dev, int max_ports);
extern struct ata_host *ata_host_alloc(struct device *dev, int n_ports);
extern struct ata_host *ata_host_alloc_pinfo(struct device *dev,
const struct ata_port_info * const * ppi, int n_ports);
extern void ata_host_get(struct ata_host *host);