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pstore/ram: Factor dmesg przs initialization out of probe()

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This will help make code clearer when we'll add support for other
message types.

This also makes probe() much shorter and understandable, plus
makes mem/record size checking a bit easier.

Implementation detail: we now use a paddr pointer, this will
be used for allocating persistent ram zones for other message
types.

Signed-off-by: Anton Vorontsov <anton.vorontsov@linaro.org>
Acked-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Anton Vorontsov 2012-05-26 06:20:21 -07:00 committed by Greg Kroah-Hartman
parent cac2eb7b58
commit f4c5d2423c
1 changed files with 62 additions and 37 deletions
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99
fs/pstore/ram.c
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@ -202,13 +202,65 @@ static struct ramoops_context oops_cxt = {
},
};
static void ramoops_free_przs(struct ramoops_context *cxt)
{
int i;
if (!cxt->przs)
return;
for (i = 0; cxt->przs[i]; i++)
persistent_ram_free(cxt->przs[i]);
kfree(cxt->przs);
}
static int ramoops_init_przs(struct device *dev, struct ramoops_context *cxt,
phys_addr_t *paddr, size_t dump_mem_sz)
{
int err = -ENOMEM;
int i;
if (!cxt->record_size)
return 0;
cxt->max_dump_cnt = dump_mem_sz / cxt->record_size;
if (!cxt->max_dump_cnt)
return -ENOMEM;
cxt->przs = kzalloc(sizeof(*cxt->przs) * cxt->max_dump_cnt,
GFP_KERNEL);
if (!cxt->przs) {
dev_err(dev, "failed to initialize a prz array for dumps\n");
return -ENOMEM;
}
for (i = 0; i < cxt->max_dump_cnt; i++) {
size_t sz = cxt->record_size;
cxt->przs[i] = persistent_ram_new(*paddr, sz, cxt->ecc);
if (IS_ERR(cxt->przs[i])) {
err = PTR_ERR(cxt->przs[i]);
dev_err(dev, "failed to request mem region (0x%zx@0x%llx): %d\n",
sz, (unsigned long long)*paddr, err);
goto fail_prz;
}
*paddr += sz;
}
return 0;
fail_prz:
ramoops_free_przs(cxt);
return err;
}
static int __init ramoops_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct ramoops_platform_data *pdata = pdev->dev.platform_data;
struct ramoops_context *cxt = &oops_cxt;
size_t dump_mem_sz;
phys_addr_t paddr;
int err = -EINVAL;
int i;
/* Only a single ramoops area allowed at a time, so fail extra
* probes.
@ -225,21 +277,6 @@ static int __init ramoops_probe(struct platform_device *pdev)
pdata->mem_size = rounddown_pow_of_two(pdata->mem_size);
pdata->record_size = rounddown_pow_of_two(pdata->record_size);
/* Check for the minimum memory size */
if (pdata->mem_size < MIN_MEM_SIZE &&
pdata->record_size < MIN_MEM_SIZE) {
pr_err("memory size too small, minimum is %lu\n",
MIN_MEM_SIZE);
goto fail_out;
}
if (pdata->mem_size < pdata->record_size) {
pr_err("The memory size must be larger than the "
"records size\n");
goto fail_out;
}
cxt->max_dump_cnt = pdata->mem_size / pdata->record_size;
cxt->dump_read_cnt = 0;
cxt->size = pdata->mem_size;
cxt->phys_addr = pdata->mem_address;
@ -247,24 +284,14 @@ static int __init ramoops_probe(struct platform_device *pdev)
cxt->dump_oops = pdata->dump_oops;
cxt->ecc = pdata->ecc;
cxt->przs = kzalloc(sizeof(*cxt->przs) * cxt->max_dump_cnt, GFP_KERNEL);
if (!cxt->przs) {
err = -ENOMEM;
dev_err(dev, "failed to initialize a prz array\n");
goto fail_out;
}
paddr = cxt->phys_addr;
for (i = 0; i < cxt->max_dump_cnt; i++) {
size_t sz = cxt->record_size;
phys_addr_t start = cxt->phys_addr + sz * i;
cxt->przs[i] = persistent_ram_new(start, sz, cxt->ecc);
if (IS_ERR(cxt->przs[i])) {
err = PTR_ERR(cxt->przs[i]);
dev_err(dev, "failed to request mem region (0x%zx@0x%llx): %d\n",
sz, (unsigned long long)start, err);
goto fail_przs;
}
dump_mem_sz = cxt->size;
err = ramoops_init_przs(dev, cxt, &paddr, dump_mem_sz);
if (err) {
pr_err("memory size too small, minimum is %lu\n",
cxt->record_size);
goto fail_count;
}
cxt->pstore.data = cxt;
@ -303,10 +330,8 @@ static int __init ramoops_probe(struct platform_device *pdev)
fail_clear:
cxt->pstore.bufsize = 0;
cxt->max_dump_cnt = 0;
fail_przs:
for (i = 0; cxt->przs[i]; i++)
persistent_ram_free(cxt->przs[i]);
kfree(cxt->przs);
fail_count:
ramoops_free_przs(cxt);
fail_out:
return err;
}