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Subject[PATCH 3/9] cciss: factor out scatter gather chain block allocation and freeing
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Date
From: Stephen M. Cameron <scameron@beardog.cce.hp.com>

cciss: factor out scatter gather chain block allocation and freeing
Rationale is that I want to use this code from the scsi half of the
driver.

Signed-off-by: Stephen M. Cameron <scameron@beardog.cce.hp.com>
---
drivers/block/cciss.c | 108 ++++++++++++++++++++++++++-----------------------
1 files changed, 58 insertions(+), 50 deletions(-)
diff --git a/drivers/block/cciss.c b/drivers/block/cciss.c
index cd8c7c2..eddb916 100644
--- a/drivers/block/cciss.c
+++ b/drivers/block/cciss.c
@@ -257,6 +257,59 @@ static inline void removeQ(CommandList_struct *c)
hlist_del_init(&c->list);
}

+static void cciss_free_sg_chain_blocks(struct Cmd_sg_list **cmd_sg_list,
+ int nr_cmds)
+{
+ int i;
+
+ if (!cmd_sg_list)
+ return;
+ for (i = 0; i < nr_cmds; i++) {
+ if (cmd_sg_list[i]) {
+ kfree(cmd_sg_list[i]->sgchain);
+ kfree(cmd_sg_list[i]);
+ cmd_sg_list[i] = NULL;
+ }
+ }
+ kfree(cmd_sg_list);
+}
+
+static struct Cmd_sg_list **cciss_allocate_sg_chain_blocks(ctlr_info_t *h,
+ int chainsize, int nr_cmds)
+{
+ int j;
+ struct Cmd_sg_list **cmd_sg_list;
+
+ if (chainsize <= 0)
+ return NULL;
+
+ cmd_sg_list = kmalloc(sizeof(*cmd_sg_list) * nr_cmds, GFP_KERNEL);
+ if (!cmd_sg_list)
+ return NULL;
+
+ /* Build up chain blocks for each command */
+ for (j = 0; j < nr_cmds; j++) {
+ cmd_sg_list[j] = kmalloc(sizeof(*cmd_sg_list[j]), GFP_KERNEL);
+ if (!cmd_sg_list[j]) {
+ dev_err(&h->pdev->dev, "Cannot get memory "
+ "for chain block.\n");
+ goto clean;
+ }
+ /* Need a block of chainsized s/g elements. */
+ cmd_sg_list[j]->sgchain = kmalloc((chainsize *
+ sizeof(SGDescriptor_struct)), GFP_KERNEL);
+ if (!cmd_sg_list[j]->sgchain) {
+ dev_err(&h->pdev->dev, "Cannot get memory "
+ "for s/g chains.\n");
+ goto clean;
+ }
+ }
+ return cmd_sg_list;
+clean:
+ cciss_free_sg_chain_blocks(cmd_sg_list, nr_cmds);
+ return NULL;
+}
+
#include "cciss_scsi.c" /* For SCSI tape support */

static const char *raid_label[] = { "0", "4", "1(1+0)", "5", "5+1", "ADG",
@@ -4238,37 +4291,10 @@ static int __devinit cciss_init_one(struct pci_dev *pdev,
goto clean4;
}
}
- hba[i]->cmd_sg_list = kmalloc(sizeof(struct Cmd_sg_list *) *
- hba[i]->nr_cmds,
- GFP_KERNEL);
- if (!hba[i]->cmd_sg_list) {
- printk(KERN_ERR "cciss%d: Cannot get memory for "
- "s/g chaining.\n", i);
+ hba[i]->cmd_sg_list = cciss_allocate_sg_chain_blocks(hba[i],
+ hba[i]->chainsize, hba[i]->nr_cmds);
+ if (!hba[i]->cmd_sg_list && hba[i]->chainsize > 0)
goto clean4;
- }
- /* Build up chain blocks for each command */
- if (hba[i]->chainsize > 0) {
- for (j = 0; j < hba[i]->nr_cmds; j++) {
- hba[i]->cmd_sg_list[j] =
- kmalloc(sizeof(struct Cmd_sg_list),
- GFP_KERNEL);
- if (!hba[i]->cmd_sg_list[j]) {
- printk(KERN_ERR "cciss%d: Cannot get memory "
- "for chain block.\n", i);
- goto clean4;
- }
- /* Need a block of chainsized s/g elements. */
- hba[i]->cmd_sg_list[j]->sgchain =
- kmalloc((hba[i]->chainsize *
- sizeof(SGDescriptor_struct)),
- GFP_KERNEL);
- if (!hba[i]->cmd_sg_list[j]->sgchain) {
- printk(KERN_ERR "cciss%d: Cannot get memory "
- "for s/g chains\n", i);
- goto clean4;
- }
- }
- }

spin_lock_init(&hba[i]->lock);

@@ -4327,16 +4353,7 @@ clean4:
for (k = 0; k < hba[i]->nr_cmds; k++)
kfree(hba[i]->scatter_list[k]);
kfree(hba[i]->scatter_list);
- /* Only free up extra s/g lists if controller supports them */
- if (hba[i]->chainsize > 0) {
- for (j = 0; j < hba[i]->nr_cmds; j++) {
- if (hba[i]->cmd_sg_list[j]) {
- kfree(hba[i]->cmd_sg_list[j]->sgchain);
- kfree(hba[i]->cmd_sg_list[j]);
- }
- }
- kfree(hba[i]->cmd_sg_list);
- }
+ cciss_free_sg_chain_blocks(hba[i]->cmd_sg_list, hba[i]->nr_cmds);
if (hba[i]->cmd_pool)
pci_free_consistent(hba[i]->pdev,
hba[i]->nr_cmds * sizeof(CommandList_struct),
@@ -4454,16 +4471,7 @@ static void __devexit cciss_remove_one(struct pci_dev *pdev)
for (j = 0; j < hba[i]->nr_cmds; j++)
kfree(hba[i]->scatter_list[j]);
kfree(hba[i]->scatter_list);
- /* Only free up extra s/g lists if controller supports them */
- if (hba[i]->chainsize > 0) {
- for (j = 0; j < hba[i]->nr_cmds; j++) {
- if (hba[i]->cmd_sg_list[j]) {
- kfree(hba[i]->cmd_sg_list[j]->sgchain);
- kfree(hba[i]->cmd_sg_list[j]);
- }
- }
- kfree(hba[i]->cmd_sg_list);
- }
+ cciss_free_sg_chain_blocks(hba[i]->cmd_sg_list, hba[i]->nr_cmds);
/*
* Deliberately omit pci_disable_device(): it does something nasty to
* Smart Array controllers that pci_enable_device does not undo


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