[media] ivtv, cx18: Make ioremap failure messages more useful for users

The error messages these drivers emitted for ioremap() failures
were misleading and not helpful for users.  Reworded those messages
to help the user take action to resolve vmalloc address space
exhaustion.

Signed-off-by: Andy Walls <awalls@md.metrocast.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

2 files changed, 29 insertions, 8 deletions

diff --git a/drivers/media/video/cx18/cx18-driver.c b/drivers/media/video/cx18/cx18-driver.c
index 98ac2e935743..676e5bef89eb 100644
--- a/drivers/media/video/cx18/cx18-driver.c
+++ b/drivers/media/video/cx18/cx18-driver.c
@@ -925,8 +925,13 @@ static int __devinit cx18_probe(struct pci_dev *pci_dev,
         cx->enc_mem = ioremap_nocache(cx->base_addr + CX18_MEM_OFFSET,
                                        CX18_MEM_SIZE);
         if (!cx->enc_mem) {
-                CX18_ERR("ioremap failed, perhaps increasing __VMALLOC_RESERVE in page.h\n");
-                CX18_ERR("or disabling CONFIG_HIGHMEM4G into the kernel would help\n");
+                CX18_ERR("ioremap failed. Can't get a window into CX23418 "
+                         "memory and register space\n");
+                CX18_ERR("Each capture card with a CX23418 needs 64 MB of "
+                         "vmalloc address space for the window\n");
+                CX18_ERR("Check the output of 'grep Vmalloc /proc/meminfo'\n");
+                CX18_ERR("Use the vmalloc= kernel command line option to set "
+                         "VmallocTotal to a larger value\n");
                 retval = -ENOMEM;
                 goto free_mem;
         }
diff --git a/drivers/media/video/ivtv/ivtv-driver.c b/drivers/media/video/ivtv/ivtv-driver.c
index e421d15b0f5c..39946420b301 100644
--- a/drivers/media/video/ivtv/ivtv-driver.c
+++ b/drivers/media/video/ivtv/ivtv-driver.c
@@ -1029,8 +1029,13 @@ static int __devinit ivtv_probe(struct pci_dev *pdev,
         itv->enc_mem = ioremap_nocache(itv->base_addr + IVTV_ENCODER_OFFSET,
                                        IVTV_ENCODER_SIZE);
         if (!itv->enc_mem) {
-                IVTV_ERR("ioremap failed, perhaps increasing __VMALLOC_RESERVE in page.h\n");
-                IVTV_ERR("or disabling CONFIG_HIGHMEM4G into the kernel would help\n");
+                IVTV_ERR("ioremap failed. Can't get a window into CX23415/6 "
+                         "encoder memory\n");
+                IVTV_ERR("Each capture card with a CX23415/6 needs 8 MB of "
+                         "vmalloc address space for this window\n");
+                IVTV_ERR("Check the output of 'grep Vmalloc /proc/meminfo'\n");
+                IVTV_ERR("Use the vmalloc= kernel command line option to set "
+                         "VmallocTotal to a larger value\n");
                 retval = -ENOMEM;
                 goto free_mem;
         }
@@ -1041,8 +1046,14 @@ static int __devinit ivtv_probe(struct pci_dev *pdev,
                 itv->dec_mem = ioremap_nocache(itv->base_addr + IVTV_DECODER_OFFSET,
                                 IVTV_DECODER_SIZE);
                 if (!itv->dec_mem) {
-                        IVTV_ERR("ioremap failed, perhaps increasing __VMALLOC_RESERVE in page.h\n");
-                        IVTV_ERR("or disabling CONFIG_HIGHMEM4G into the kernel would help\n");
+                        IVTV_ERR("ioremap failed. Can't get a window into "
+                                 "CX23415 decoder memory\n");
+                        IVTV_ERR("Each capture card with a CX23415 needs 8 MB "
+                                 "of vmalloc address space for this window\n");
+                        IVTV_ERR("Check the output of 'grep Vmalloc "
+                                 "/proc/meminfo'\n");
+                        IVTV_ERR("Use the vmalloc= kernel command line option "
+                                 "to set VmallocTotal to a larger value\n");
                         retval = -ENOMEM;
                         goto free_mem;
                 }
@@ -1057,8 +1068,13 @@ static int __devinit ivtv_probe(struct pci_dev *pdev,
         itv->reg_mem =
             ioremap_nocache(itv->base_addr + IVTV_REG_OFFSET, IVTV_REG_SIZE);
         if (!itv->reg_mem) {
-                IVTV_ERR("ioremap failed, perhaps increasing __VMALLOC_RESERVE in page.h\n");
-                IVTV_ERR("or disabling CONFIG_HIGHMEM4G into the kernel would help\n");
+                IVTV_ERR("ioremap failed. Can't get a window into CX23415/6 "
+                         "register space\n");
+                IVTV_ERR("Each capture card with a CX23415/6 needs 64 kB of "
+                         "vmalloc address space for this window\n");
+                IVTV_ERR("Check the output of 'grep Vmalloc /proc/meminfo'\n");
+                IVTV_ERR("Use the vmalloc= kernel command line option to set "
+                         "VmallocTotal to a larger value\n");
                 retval = -ENOMEM;
                 goto free_io;
         }