> Subject: [PATCH 1/1] =A0=A0=A0 drivers/gpu/drm/i915: Fixed uninitialized<br= >=A0variables (warnings).<br>MIME-Version: 1.0<br>Content-Type: text/plain;= charset=3DUTF-8<br>Content-Transfer-Encoding: 8bit<br><br>As you see, this= modifications were really very important because if the remain variable re= ceives a value lower or equals than 0 from the args->size variable, inde= ed, a bad behavior could ocurrs.<br> <br>Let me explain:<br>The variable ret would never be initialized if the f= unction doesn't enter inside of the loop. So that, the function will re= turn a strange (undefined) value when it reaches the final.<br><br>If you&#= 39;ve a better solution or if I commited a mistake in my changes, please ta= lk me about. I'm sure I'm a newcomer, hehe.<br> <br>I'm using the GCC: gcc version 4.6.1 (Ubuntu/Linaro 4.6.1-9ubuntu3)= <br><br>Warnings received during make operation:<br>utroz at utrozpc:~/linux$ = make > make_output<br>=A0=A0=A0 : In function =91i915_gem_pread_ioctl=92= :<br>drivers/gpu/drm/i915/i915_gem.c:455:21: warning: =91ret=92 may be used= uninitialized in this function [-Wuninitialized]<br> drivers/gpu/drm/i915/i915_gem.c:390:38: note: =91ret=92 was declared here<b= r>drivers/gpu/drm/i915/i915_gem.c: In function =91i915_gem_pwrite_ioctl=92:= <br>drivers/gpu/drm/i915/i915_gem.c:871:21: warning: =91ret=92 may be used = uninitialized in this function [-Wuninitialized]<br> drivers/gpu/drm/i915/i915_gem.c:797:38: note: =91ret=92 was declared here<b= r><br>Signed-off-by: Raphael S.Carvalho <<a href=3D"mailto:rsc.utroz at gma= il.com">rsc.utroz at gmail.com</a>><br>---<br>=A0drivers/gpu/drm/i915/i915_= gem.c |=A0=A0 12 ++++++++++--<br> =A01 files changed, 10 insertions(+), 2 deletions(-)<br><br>diff --git a/dr= ivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c<br>index 0d= 1e4b7..b0a0004 100644<br>--- a/drivers/gpu/drm/i915/i915_gem.c<br>+++ b/dri= vers/gpu/drm/i915/i915_gem.c<br> @@ -392,6 +392,10 @@ i915_gem_shmem_pread_slow(struct drm_device *dev,<br>= =A0<br>=A0=A0=A0=A0 user_data =3D (char __user *) (uintptr_t) args->data= _ptr;<br>=A0=A0=A0=A0 remain =3D args->size;<br>+=A0=A0=A0 if (remain &l= t;=3D 0) {<br>+=A0=A0=A0 =A0=A0=A0 ret =3D -EINVAL;<br> +=A0=A0=A0 =A0=A0=A0 goto final;<br>+=A0=A0=A0 }<br>=A0<br>=A0=A0=A0=A0 obj= _do_bit17_swizzling =3D i915_gem_object_needs_bit17_swizzle(obj);<br>=A0<br= >@@ -451,7 +455,7 @@ out:<br>=A0=A0=A0=A0 /* Fixup: Kill any reinstated bac= king storage pages */<br>=A0=A0=A0=A0 if (obj->madv =3D=3D __I915_MADV_P= URGED)<br> =A0=A0=A0=A0 =A0=A0=A0 i915_gem_object_truncate(obj);<br>-<br>+final:<br>= =A0=A0=A0=A0 return ret;<br>=A0}<br>=A0<br>@@ -799,6 +803,10 @@ i915_gem_sh= mem_pwrite_slow(struct drm_device *dev,<br>=A0<br>=A0=A0=A0=A0 user_data = =3D (char __user *) (uintptr_t) args->data_ptr;<br> =A0=A0=A0=A0 remain =3D args->size;<br>+=A0=A0=A0 if (remain <=3D 0) = {<br>+=A0=A0=A0 =A0=A0=A0 ret =3D -EINVAL;<br>+=A0=A0=A0 =A0=A0=A0 goto fin= al;<br>+=A0=A0=A0 }<br>=A0<br>=A0=A0=A0=A0 obj_do_bit17_swizzling =3D i915_= gem_object_needs_bit17_swizzle(obj);<br>=A0<br>@@ -867,7 +875,7 @@ out:<br> =A0=A0=A0=A0 =A0=A0=A0 i915_gem_clflush_object(obj);<br>=A0=A0=A0=A0 =A0=A0= =A0 intel_gtt_chipset_flush();<br>=A0=A0=A0=A0 }<br>-<br>+final:<br>=A0=A0= =A0=A0 return ret;<br>=A0}<br>=A0<br>-- <br>1.7.5.4<br><br>
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