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authorGerald Schaefer <gerald.schaefer@de.ibm.com>2009-03-18 08:27:35 -0400
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2009-03-18 08:28:13 -0400
commit2887fc5aa60803b9d6d38c79248805f08d8b0e28 (patch)
tree1aa69da137c2be0a93e9e639750afe065dbdf98a /arch
parentcf087343805ebfea2b1234b06fd5f12273e865b1 (diff)
[S390] Dont check for pfn_valid() in uaccess_pt.c
pfn_valid() actually checks for a valid struct page and not for a valid pfn. Using xip mappings w/o struct pages, this will result in -EFAULT returned by the (page table walk) user copy functions, even though there is valid memory. Those user copy functions don't need a struct page, so this patch just removes the pfn_valid() check. Signed-off-by: Gerald Schaefer <gerald.schaefer@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch')
-rw-r--r--arch/s390/lib/uaccess_pt.c18
1 files changed, 0 insertions, 18 deletions
diff --git a/arch/s390/lib/uaccess_pt.c b/arch/s390/lib/uaccess_pt.c
index d66215b0fde9..b0b84c35b0ad 100644
--- a/arch/s390/lib/uaccess_pt.c
+++ b/arch/s390/lib/uaccess_pt.c
@@ -119,8 +119,6 @@ retry:
119 goto fault; 119 goto fault;
120 120
121 pfn = pte_pfn(*pte); 121 pfn = pte_pfn(*pte);
122 if (!pfn_valid(pfn))
123 goto out;
124 122
125 offset = uaddr & (PAGE_SIZE - 1); 123 offset = uaddr & (PAGE_SIZE - 1);
126 size = min(n - done, PAGE_SIZE - offset); 124 size = min(n - done, PAGE_SIZE - offset);
@@ -135,7 +133,6 @@ retry:
135 done += size; 133 done += size;
136 uaddr += size; 134 uaddr += size;
137 } while (done < n); 135 } while (done < n);
138out:
139 spin_unlock(&mm->page_table_lock); 136 spin_unlock(&mm->page_table_lock);
140 return n - done; 137 return n - done;
141fault: 138fault:
@@ -163,9 +160,6 @@ retry:
163 goto fault; 160 goto fault;
164 161
165 pfn = pte_pfn(*pte); 162 pfn = pte_pfn(*pte);
166 if (!pfn_valid(pfn))
167 goto out;
168
169 ret = (pfn << PAGE_SHIFT) + (uaddr & (PAGE_SIZE - 1)); 163 ret = (pfn << PAGE_SHIFT) + (uaddr & (PAGE_SIZE - 1));
170out: 164out:
171 return ret; 165 return ret;
@@ -244,11 +238,6 @@ retry:
244 goto fault; 238 goto fault;
245 239
246 pfn = pte_pfn(*pte); 240 pfn = pte_pfn(*pte);
247 if (!pfn_valid(pfn)) {
248 done = -1;
249 goto out;
250 }
251
252 offset = uaddr & (PAGE_SIZE-1); 241 offset = uaddr & (PAGE_SIZE-1);
253 addr = (char *)(pfn << PAGE_SHIFT) + offset; 242 addr = (char *)(pfn << PAGE_SHIFT) + offset;
254 len = min(count - done, PAGE_SIZE - offset); 243 len = min(count - done, PAGE_SIZE - offset);
@@ -256,7 +245,6 @@ retry:
256 done += len_str; 245 done += len_str;
257 uaddr += len_str; 246 uaddr += len_str;
258 } while ((len_str == len) && (done < count)); 247 } while ((len_str == len) && (done < count));
259out:
260 spin_unlock(&mm->page_table_lock); 248 spin_unlock(&mm->page_table_lock);
261 return done + 1; 249 return done + 1;
262fault: 250fault:
@@ -325,12 +313,7 @@ retry:
325 } 313 }
326 314
327 pfn_from = pte_pfn(*pte_from); 315 pfn_from = pte_pfn(*pte_from);
328 if (!pfn_valid(pfn_from))
329 goto out;
330 pfn_to = pte_pfn(*pte_to); 316 pfn_to = pte_pfn(*pte_to);
331 if (!pfn_valid(pfn_to))
332 goto out;
333
334 offset_from = uaddr_from & (PAGE_SIZE-1); 317 offset_from = uaddr_from & (PAGE_SIZE-1);
335 offset_to = uaddr_from & (PAGE_SIZE-1); 318 offset_to = uaddr_from & (PAGE_SIZE-1);
336 offset_max = max(offset_from, offset_to); 319 offset_max = max(offset_from, offset_to);
@@ -342,7 +325,6 @@ retry:
342 uaddr_from += size; 325 uaddr_from += size;
343 uaddr_to += size; 326 uaddr_to += size;
344 } while (done < n); 327 } while (done < n);
345out:
346 spin_unlock(&mm->page_table_lock); 328 spin_unlock(&mm->page_table_lock);
347 return n - done; 329 return n - done;
348fault: 330fault: