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authorAnton Vorontsov <anton.vorontsov@linaro.org>2012-05-26 06:20:21 -0700
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2012-06-13 16:59:28 -0700
commitf4c5d2423c64266ba0daa9cc803d1d5ba469fe36 (patch)
tree2c963e35f84f0603c2d1f228116b86fcac1b246b /fs/pstore
parentcac2eb7b580c95e3871a71276c99e2bd751a1624 (diff)
pstore/ram: Factor dmesg przs initialization out of probe()
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>
Diffstat (limited to 'fs/pstore')
-rw-r--r--fs/pstore/ram.c99
1 files changed, 62 insertions, 37 deletions
diff --git a/fs/pstore/ram.c b/fs/pstore/ram.c
index 9b274b98bf3..6b767673849 100644
--- a/fs/pstore/ram.c
+++ b/fs/pstore/ram.c
@@ -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;
- }
-
- for (i = 0; i < cxt->max_dump_cnt; i++) {
- size_t sz = cxt->record_size;
- phys_addr_t start = cxt->phys_addr + sz * i;
+ paddr = cxt->phys_addr;
- 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 @@ fail_buf:
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;
}